2. Refresher Question What is a leaf’s main function? Make food! PHOTOSYNTHESIS

3. Refresher Question What plant structure do you see here: http://www.botgard.ucla.edu/html/botanytextbooks/generalbotany/images/typesofroots/Sonchusroots.jpg ROOT

4. Refresher Question What is the green pigment that captures light called? Chlorophyll

5. Refresher Question What is the cell organelle that contains chlorophyll called? Chloroplast http://www.cbs.dtu.dk/staff/dave/roanoke/chloroplast.gif

6. Plant Video National Geographic Video

7. Photosynthesis Plants use energy from sunlight to make food from carbon dioxide and water. 6CO2 + 6H2O Sunlight C 6 H12O 6 + 6O2 Chlorophyll Green Color Part of the Chloroplasts Captures sunlight

8. http://my.hrw.com/apps/alchemy/editors/viewers/popup_viewer.html

9. Plant Puzzler What is the energy source that drives photosynthesis? SUN

10. Sugar (Glucose) C 6 H12O 6  6 Carbon, 12 Hydrogen, 6 Oxygen Glucose is stored energy plants use for food Made from CO2, H2O, Sunlight and chlorophyll

11. Plant Puzzler The kind of food produced directly from photosynthesis is __________? Sugar = Glucose = C 6 H12O 6

12. Gas Exchange in Leaves Cuticle: waxy covering that protects plant How does gas “break through” that tough barrier? Stoma! (plural= stomata) an opening in a leaf or stem that allows gas exchange Each stoma has 2 Guard Cells Guard Cells open or close stoma Closed stoma = no gas exchange Open stoma = gas exchange Carbon Dioxide (CO2), Oxygen (O2), and Water Vapor (H2O)

13. http://my.hrw.com/la/eolit05/nsmedia/eolit05_image_gallery.html

14. Plant Puzzler An opening in a plant that allows for gas exchange is called a __________? What gases are transported through the stoma? Stoma CO2, O2, H2O

15. Question #1 Put a plant under a dark box. Is this plant undergoing photosynthesis? Why or why not? http://www.fightingquaker.com/jaropt/table_plant.jpg http://homepage.eircom.net/~pakform/bse_007-3.gif

16. Question #2 Describe what you think will happen to the life seen here (and on Earth), after a meteor blackened the sky so that no sun could shine through?

17. Question #3 Are the leaves you see here undergoing photosynthesis? Why or why not? Pretend that the branch is still attached to the living tree.

18. Question #4 If you and a large tree were locked in an airtight compartment, with plenty of food, water, and nutrients, could you survive? Explain your answer.